Ann Druyan ( ;In the revised edition of Cosmos: A Personal Voyage, Ann Druyan introduces herself in a . born June 13, 1949) is an American documentary producer and director specializing in the communi
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff829a4c463e80737cf970881a2e2170a43e0d925d87ec88c186b3d4702a53b. Chain 2 (Bitcoin): anchored in block 954027 (2026-06-17T00:55:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/394acea3-8fb5-4cb4-a1ab-f8f9f4e6ac14.json and https://artists.proofprofile.net/proofs/artist/394acea3-8fb5-4cb4-a1ab-f8f9f4e6ac14.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.